code: def test_scalar_search_wolfe1(self):
      c = 0
      for name, phi, derphi, old_phi0 in self.scalar_iter():
          c += 1
          s, phi1, phi0 = ls.scalar_search_wolfe1(
              phi, derphi, phi(0), old_phi0, derphi(0)
          )
          assert_fp_equal(phi0, phi(0), name)
          assert_fp_equal(phi1, phi(s), name)
          assert_wolfe(s, phi, derphi, err_msg=name)
  
      assert c > 3
  
imports: from numpy.testing import assert_equal, assert_array_almost_equal, assert_array_almost_equal_nulp, assert_warns, suppress_warnings
  import scipy.optimize._linesearch
  from scipy.optimize._linesearch import LineSearchWarning
  import numpy
label_desc: Use image node_id 9 for calling the TestLineSearch obj's underlying member method code with example usage: obj.test_scalar_search_wolfe1() without return types